Table 1. General Characteristics of the Study Population at the Beginning of Follow-Up: The E3N Cohort

CharacteristicsPopulation (n=80 308)
Values are mean (SD) or No. (%).
Age at entry, y54.0 (4.3)
Follow-up, y10.1 (4.6)
Body-mass index, kg/m222.6 (3.2)
Overweight, 25≤BMI<30 kg/m211 808 (14.6)
Obesity, BMI ≥30 kg/m22483 (3.1)
Current smokers7095 (9.9)
High school graduate66 002 (83.1)
Age at menopause, y50.2 (3.8)
Hysterectomy16 257 (20.2)
Parity2.2 (0.9)
Past use of oral contraceptives46 387 (57.8)